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A use case diagram [1] is a graphical depiction of a user's possible interactions with a system. A use case diagram shows various use cases and different types of users the system has and will often be accompanied by other types of diagrams as well. The use cases are represented by either circles or ellipses. The actors are often shown as stick ...
Use case analysis is a technique used to identify the requirements of a system (normally associated with software/process design) and the information used to both define processes used and classes (which are a collection of actors and processes) which will be used both in the use case diagram and the overall use case in the development or redesign of a software system or program.
Process steps for a happy path are also used in the context of a use case. In contrast to the happy path, process steps for alternate flow and exception flow may also be documented. [3] Happy path test is a well-defined test case using known input, which executes without exception and produces an expected output. [4]
Sequence diagrams are sometimes called event diagrams or event scenarios. For a particular scenario of a use case, the diagrams show the events that external actors generate, their order, and possible inter-system events. [2] The diagram emphasizes events that cross the system boundary from actors to systems.
Shows the process's order of operation. A line coming from one symbol and pointing at another. [16] Arrowheads are added if the flow is not the standard top-to-bottom, left-to right. [17] Terminal [16] Indicates the beginning and ending of a program or sub-process. Represented as a stadium, [16] oval or rounded (fillet) rectangle. They usually ...
In addition, other behavioral UML diagrams such as activity diagrams, sequence diagrams, communication diagrams, and state machine diagrams can also be used to visualize use cases accordingly. Specifically, a System Sequence Diagram (SSD) is a sequence diagram often used to show the interactions between the external actors and the system under ...
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This example shows the systematic process that takes place whilst the algorithm is processed. The initial value of x is zero, but i, although defined, has not been assigned a value. Thus, its initial value is unknown. As we execute the program, line by line, the values of i and x change, reflecting each statement of the source code in execution ...